diff --git a/docs/lenskit.bib b/docs/lenskit.bib
index d18fbca6a..fe0022e40 100644
--- a/docs/lenskit.bib
+++ b/docs/lenskit.bib
@@ -213,7 +213,7 @@ @article{gopalanScalableRecommendationPoisson2013a
   eprint = {1311.1704},
   primaryclass = {cs, stat},
   urldate = {2017-02-09},
-  archiveprefix = {arxiv},
+  archiveprefix = {arXiv},
   keywords = {LensKit References,Zotero Import (Mar 30),Zotero Import (Mar 30)/My Library,Zotero Import (Mar 30)/My Library/Recommender Systems/Matrix Factorization}
 }